Binder-less chemical grafting of SiO2 nanoparticles onto polyethylene separators for lithium-ion batteries

Wonjun Na, Ki Hwan Koh, Albert S. Lee, Sangho Cho, Byoeri Ok, Suk-Won Hwang, Jin Hong Lee, Chong Min Koo

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Silica nanoparticles were chemically grafted onto a porous polyethylene separator to improve the adhesion strength, thermal stability, and electrochemical performance of a polyolefin separator. A surface activation via UVO plasma treatment, followed by silane hybridization yielded a polymeric binder-free, thin coating of SiO2 nanoparticles onto the separator. The chemical grafting provided a much stronger adhesive strength (> 2.5 N/cm), reduced thermal shrinkage (< 5% at 120 °C), and higher ionic conductivity (0.84 mS/cm) than conventional physical coating of a ceramic particle-based polymer composite. Lithium-ion batteries fabricated with metallic lithium as the anode, a LiFePO4 (LFP) cathode and SiO2-grafted separator showed an excellent rate capability (68 mAh/g at 5 C) and cycling performance (143 mAh/g after 200 cycles).

Original languageEnglish
Pages (from-to)621-627
Number of pages7
JournalJournal of Membrane Science
DOIs
Publication statusPublished - 2019 Mar 1

Keywords

  • Chemical grafting
  • Lithium-ion battery
  • Separator
  • Silica nanoparticle

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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